基于电平扫描法的超高频局部放电测量方法的特性分析

发布时间：2018-01-20 06:44

本文关键词： 局部放电超高频扫描比较脉冲电流放电谱图误差分析　出处：《高电压技术》2014年08期 　论文类型：期刊论文

【摘要】：为准确采集超高频局部放电(UHF PD)信号并提取其特征,分析了采用基于电平扫描法的UHF PD检测系统测量局部放电信号的基本原理和特征提取方法。分别采用电平扫描法、超高频波形采集法及脉冲电流法采集局部放电信号,分析了3种方法采集所得信号的差异,验证了电平扫描法的有效性。并采用高频正弦信号分析了系统的测量误差。结果表明:3种测量方法所得谱图相位特征基本一致,相位电平谱图波形相关度0.9;电平扫描法测得的脉冲幅值小于实际幅值,其检测灵敏度与放电检测时的脉冲宽度有关。此外,增大信号幅值、降低检测频带以及增大扫描频率均可提高电平扫描法的检测精度。
[Abstract]:In order to collect UHF PD signals accurately and extract their features. The basic principle and feature extraction method of UHF PD detection system based on level scanning method are analyzed. UHF waveform acquisition method and pulse current method are used to collect partial discharge signals, and the differences between the three methods are analyzed. The validity of the level scanning method is verified, and the measurement error of the system is analyzed by using the high frequency sinusoidal signal. The results show that the phase characteristics of the spectrum obtained by the three measurement methods are basically the same. The correlativity of phase level spectrum waveform is 0.9; The pulse amplitude measured by the level scanning method is smaller than the actual amplitude, and the detection sensitivity is related to the pulse width in the discharge detection. In addition, the amplitude of the signal is increased. The detection accuracy of the level scanning method can be improved by reducing the detection band and increasing the scanning frequency.
【作者单位】：重庆大学输配电装备及系统安全与新技术国家重点实验室;国网四川省电力公司;
【基金】：国家重点基础研究发展计划(973计划)(2012CB215205) 国家创新研究群体基金(51021005)~~
【分类号】：TM855
【正文快照】： 0引言1高压电气设备在制造、运输、安装和运行过程中,不可避免地会产生一些绝缘缺陷,进而引起局部放电(partial discharge,PD),威胁到电气设备的运行安全[1]。因此,实时监测电气设备的局部放电、——及时发现并消除故障对于保障电力系统安全十分重要。目前检测电气设备局部放

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